According to some of the other threads, the announcement was seen in the stores of Gamestop (hence you can't find a high quality image of the screenshot; notice how it's on an angle?) on a poster, and the event is probably meant to build hype for B2W2.
No matter how this plays out, unless I see an Australian annoucnement of Keldeo I'm still not happy.
Edit: UK event announced. STILL NOT HAPPY, JAN. (side note: Yes, I do know about video tags, but I don't want to disrupt too much from the topic by its mere appearance. It's there for you to click.)